✨ [RUM-14582] track view counters

[bcaudan]

Motivation

Add counts of error, action and resource related to the main process view

Changes

• Improve types around assembly
• Listen to ServerEvents to populate event counters
• Throttle view event updates to avoid bursts

Test instructions

Unit tests only for now, it could be tested e2e in error collection PR

Checklist

• Tested locally (playground)
• Added unit tests for this change.
• Added e2e/integration tests for this change.

[datadog-datadog-prod-us1-2]

✅ Code Quality    ✅ Code Vulnerabilities    ✅ Library Vulnerabilities

🎉 All green!

🛠️ No new code quality issues
🛡️ No new code vulnerabilities
📚 No new vulnerable libraries detected

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[cdn34dd]

I think this is fine to merge as is, but I'd like to discuss some potential updates next week regarding how we're handling subscriptions. Nothing major, but now that multiple classes can handle multiple subscriptions, tracking data flow can get complicated very fast and I'd like to make it easier to know at a glace what subscribes to what.